<template>
    <div>
      <!-- 面包屑导航区域 -->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
      </el-breadcrumb>
  
      <!-- 卡片视图 -->
      <el-card>
        <!-- 提示区域 -->
        <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
        </el-alert>
        <!-- 步骤条区域 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
          <el-step title="基本信息"></el-step>
          <el-step title="商品参数"></el-step>
          <el-step title="商品属性"></el-step>
          <el-step title="商品图片"></el-step>
          <el-step title="商品内容"></el-step>
          <el-step title="完成"></el-step>
        </el-steps>
  
        <!-- tab栏区域 -->
  
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
          <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
            <el-tab-pane label="基本信息" name="0">
              <el-form-item label="商品名称" prop="goods_name">
                <el-input v-model="addForm.goods_name"></el-input>
              </el-form-item>
              <el-form-item label="商品价格" prop="goods_price">
                <el-input v-model="addForm.goods_price" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品重量" prop="goods_weight">
                <el-input v-model="addForm.goods_weight" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品数量" prop="goods_number">
                <el-input v-model="addForm.goods_number" type="number"></el-input>
              </el-form-item>
              <el-form-item label="商品分类" prop="goods_cat">
                <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="addForm.goods_cat" @change="handleChange">
                </el-cascader>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品参数" name="1">
              <!-- 渲染表单的Item项 -->
              <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                <!-- 复选框组 -->
                <el-checkbox-group v-model="item.attr_vals">
                  <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                </el-checkbox-group>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品属性" name="2">
              <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                <el-input v-model="item.attr_vals"></el-input>
              </el-form-item>
            </el-tab-pane>
            <el-tab-pane label="商品图片" name="3">
              <!-- action 表示图片要上传到的后台API地址 -->
              <el-upload :action="uploadURL" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
              </el-upload>
            </el-tab-pane>
            <el-tab-pane label="商品内容" name="4">
              <!-- 富文本编辑器组件 -->
              <quill-editor v-model="addForm.goods_introduce"></quill-editor>
              <!-- 添加商品的按钮 -->
              <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
            </el-tab-pane>
          </el-tabs>
        </el-form>
  
      </el-card>
  
      <!-- 图片预览 -->
      <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
        <img :src="previewPath" alt="" class="previewImg">
      </el-dialog>
    </div>
  </template>
  
  <script>
  import _ from 'lodash'
  
  export default {
    data() {
      return {
        activeIndex: '0',
        // 添加商品的表单数据对象
        addForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          // 商品所属的分类数组
          goods_cat: [],
          // 图片的数组
          pics: [],
          // 商品的详情描述
          goods_introduce: '',
          attrs: []
        },
        addFormRules: {
          goods_name: [
            { required: true, message: '请输入商品名称', trigger: 'blur' }
          ],
          goods_price: [
            { required: true, message: '请输入商品价格', trigger: 'blur' }
          ],
          goods_weight: [
            { required: true, message: '请输入商品重量', trigger: 'blur' }
          ],
          goods_number: [
            { required: true, message: '请输入商品数量', trigger: 'blur' }
          ],
          goods_cat: [
            { required: true, message: '请选择商品分类', trigger: 'blur' }
          ]
        },
        // 商品分类列表
        catelist: [],
        cateProps: {
          label: 'cat_name',
          value: 'cat_id',
          children: 'children'
        },
        // 动态参数列表数据
        manyTableData: [],
        // 静态属性列表数据
        onlyTableData: [],
        // 上传图片的URL地址
        uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
        // 图片上传组件的headers请求头对象
        headerObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        previewPath: '',
        previewVisible: false
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 获取所有商品分类数据
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
  
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类数据失败！')
        }
  
        this.catelist = res.data
        console.log(this.catelist)
      },
      // 级联选择器选中项变化，会触发这个函数
      handleChange() {
        console.log(this.addForm.goods_cat)
        if (this.addForm.goods_cat.length !== 3) {
          this.addForm.goods_cat = []
        }
      },
      beforeTabLeave(activeName, oldActiveName) {
        // console.log('即将离开的标签页名字是：' + oldActiveName)
        // console.log('即将进入的标签页名字是：' + activeName)
        // return false
        if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
          this.$message.error('请先选择商品分类！')
          return false
        }
      },
      async tabClicked() {
        // console.log(this.activeIndex)
        // 证明访问的是动态参数面板
        if (this.activeIndex === '1') {
          const { data: res } = await this.$http.get(
            `categories/${this.cateId}/attributes`,
            {
              params: { sel: 'many' }
            }
          )
  
          if (res.meta.status !== 200) {
            return this.$message.error('获取动态参数列表失败！')
          }
  
          console.log(res.data)
          res.data.forEach(item => {
            item.attr_vals =
              item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
          })
          this.manyTableData = res.data
        } else if (this.activeIndex === '2') {
          const { data: res } = await this.$http.get(
            `categories/${this.cateId}/attributes`,
            {
              params: { sel: 'only' }
            }
          )
  
          if (res.meta.status !== 200) {
            return this.$message.error('获取静态属性失败！')
          }
  
          console.log(res.data)
          this.onlyTableData = res.data
        }
      },
      // 处理图片预览效果
      handlePreview(file) {
        console.log(file)
        this.previewPath = file.response.data.url
        this.previewVisible = true
      },
      // 处理移除图片的操作
      handleRemove(file) {
        // console.log(file)
        // 1. 获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path
        // 2. 从 pics 数组中，找到这个图片对应的索引值
        const i = this.addForm.pics.findIndex(x => x.pic === filePath)
        // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
        this.addForm.pics.splice(i, 1)
        console.log(this.addForm)
      },
      // 监听图片上传成功的事件
      handleSuccess(response) {
        console.log(response)
        // 1. 拼接得到一个图片信息对象
        const picInfo = { pic: response.data.tmp_path }
        // 2. 将图片信息对象，push 到pics数组中
        this.addForm.pics.push(picInfo)
        console.log(this.addForm)
      },
      // 添加商品
      add() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) {
            return this.$message.error('请填写必要的表单项！')
          }
          // 执行添加的业务逻辑
          // lodash   cloneDeep(obj)
          const form = _.cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')
          // 处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          // 处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs
          console.log(form)
  
          // 发起请求添加商品
          // 商品的名称，必须是唯一的
          const { data: res } = await this.$http.post('goods', form)
  
          if (res.meta.status !== 201) {
            return this.$message.error('添加商品失败！')
          }
  
          this.$message.success('添加商品成功！')
          this.$router.push('/goods')
        })
      }
    },
    computed: {
      cateId() {
        if (this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
        }
        return null
      }
    }
  }
  </script>
  
  <style lang="less" scoped>
  .el-checkbox {
    margin: 0 10px 0 0 !important;
  }
  
  .previewImg {
    width: 100%;
  }
  
  .btnAdd {
    margin-top: 15px;
  }
  </style>
  